fix paraformer online fbank cache bug

haoneng.lhn

2023-05-18 47bd60924c47baefd37f9f12866ec0d24055bc62

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.